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Cassiopeia constellation of the northern sky, consists of a group of stars, in a symmetrical position of the Big Dipper than the north celestial pole. Cassiopeia is a northern constellation, representing Cassiopeia, the legendary queen of Ethiopia.
It is one of the 88 modern constellations and was also one of the 48 constellations listed by Ptolemy.
Easily recognizable thanks to its shape zigzag, is especially characteristic of the autumn starry nights, while from the northern hemisphere is well observable for most of the year; It is crossed by the Milky Way and is therefore very rich star fields and dense stellar clusters.
If you looked at the Sun from Alpha Centauri, the nearest star, it would appear in Cassiopeia.
Cassiopeia is one of the most characteristic and most recognizable constellations in the northern sky. Since it is very close to the north celestial pole, it remains visible in the sky all night throughout the temperate zone of the northern hemisphere; Southern Hemisphere is only visible from tropical areas. Then the north celestial pole, it is located opposite to the Big Dipper: the northern hemisphere, when Cassiopeia is high in the sky, the Big Dipper is low on the horizon. The constellation has an area of 598 square degrees and is easily recognizable by its shape W or M, depending on the seasons: during the northern autumn is observed high in the sky to the north and its orientation makes it resemble an M; conversely, in the spring evenings it is hugging the northern horizon and is oriented according to the letter W. Cassiopeia gets stuck between Cepheus and Andromeda and is traversed throughout its length from the plane of the Milky Way, so the stars appearing very rich. Beyond its five brightest stars, Cassiopeia is also greatly extended northward, occupying a large area of the sky where the Milky Way is heavily obscured by interstellar dust and is therefore relatively low in stars and flashy objects.
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